Electric light bulb, etc.



Z 0 r M 0 n d D. TROMPETER ELECTRIC LIGHT BULB, ETC

Original Filed March 30. 1931 MW nhmt m n f fl u g, 0 7 8 1 6 1 1 9 Hm, I ll March 12, 1935.

- Patented 12, 1935 UNITED sTATEs 1,994,056 ELEc'rmo uon'r BULB, are. David Tronipeter, New York, N. Y.

Application March 30, 1931, Serial No. 526,286 Renewed August 8, 1934 6Claims.

This invention relates to new and useful-improvements in electric light bulbs.

One object is to increase the intensity of the light radiated by an electric light bulb without increasing the amount of power consumed therein.

Another object is to provide a more efficient electric light bulb.

Another object is to provide an electric light bulb having all the advantages of a clear glass bulb without the drawback of the glare experienced when a clear bulb is used and all the advantages of the translucent glass bulb without the accompanying loss in light radiation.

In accordance with the invention that sector of the glass wall of the light bulb situated behind the filament and constituting the less effective light radiating area-of the lamp bulb is converted into a reflector of the light rays emitted by the filament, while preferably a translucent shield is interposed within the bulb between the free end of the filament supporting stem and that sector of the glass wall of the bulb which constitutes the effective light radiating sector thereof.

In the drawing, wherein are illustrated certain embodiments of the invention as now favored,

Fig. 1 is a view partly in section of one form of l mp;

Fig. 2 is a view partly in section of a modification;

Fig. 3 is a sectional view of another modified form. and

Fig. 4 is a view of the invention applied to an existing electric light bulb.

Like reference characters designate corre-- spending parts throughout. I

The bulb may be of any preferred shape, the one illustrated being of conventional form having an outer shell or wall 6 of clear glass, a filament supporting stem '7, a. filament 8, and a screw sleeve 9. As such bulb is shown in Figs. 1, 2 and 3, the same has an upper semi-spherical wall at the end thereof opposite the adapter, and a frusto-conical wall at its opposite end.

As is well known the effective light rays emanating from an electric light bulb of this shape are radiated principally by said semispherical wall, the rays radiating through said frustro-conical wall being comparatively ineffective. These inefiectively employed light rays could however be more gainfully employed if they were radiated through said semi-spherical wall. With this end in view the frustro-conical or equivalent wall of the glass bulb is provided with a mirrored surface 10 for reflecting the light rays toward the semi-spherical wallof the glass bulb. This reflecting mirror may be constructed in any preferred way as for example by plating the interior of the glass wall, or by placing a metallic reflector upon the exterior of the glass wall (Figure 3). A metallic mirror could be employed within the bulb instead of outside the same, such mirror being preferably of sectional construction and suitably anchored to the 10 interior wall of the lamp.

A shield 11 of translucent material may likewise be positioned in front of the filament in spaced relation thereto. This translucent shield may be constructed in any preferred manner as by coating the interior or exterior of the semispherical area of the glass wall with a suitable frosting or glaze. It is shown as in the form of a curved shell secured as at 12 to the free end of the central glass stem 7 which supports the filament 8. This cup shaped translucent shield will eliminate glare without in any way impairing the effectiveness of a large number of the light rays which will be reflected from the mirrored surface 10 and projected through the free opening 13 formed between the lip of cup shaped shield or shell 11 and the mirrored surface 10 (Figure 1).

In the embodiment shown in Figure 2, a cup shaped lens 14, having a coating of translucent material 11 upon one surface thereof, is employed to intensify the light rays. This lens is anchored at 12 to the free end of the filament supporting stem 7. The reflector 10 of Figure 2 performs the same function as the reflector of Figure 1.

In Figure ,3 the reflector 10 is secured to the exterior of the frustro-conical glass wall of the bulb in any preferred manner, while in the embodiment shown in Figure 4 a reflector 15 is merely placed over an existing electric light bulb of the prior art.

A receptacle 16 may likewise be secured to or embodied in the base of the filament supporting stem 7. This receptacle may be used to house a chemical 1'1 for generating a predetermined gas such for example as nitrogen, the gas being generated when current is applied to the lamp to heat its filament 8.

What is claimed is:

1. As a new article of manufacture, a filament unit for an electric light bulb having the outer end of the filament normally carried by the free end of the filament supporting stem partially enclosed by a cup-shaped translucent shield, the 65 closed by a cup-shaped translucent lens, the' normally free end of the filament supporting stem being anchored to the interior of the cup substantially centrally thereof.

3. In an electric light bulb, in combination, a glass container having a frustro-conical sleeve shaped lower portion, a filament, a stem for supporting the filament, and a cup shaped translucent shield partially enclosing the filament and; stem, the normally free end of the filament supporting stem being secured to the interior of the cup.

4. In an electric light bulb, in combination, a glass container having a frustro-conical sleeve shaped lower portion, a filament, a supporting stem for said filament, and a cup-shaped lens partially enclosing the filament and stem, the normally free end of the filament supporting stem being secured to the interior of the cup.

5. In an electric light bulb, in combination, a glass container having a frustro-conical sleeve shaped lower portion the interior wall of 'said sleevehaving a mirror-like surface, a filament, a supporting stem for saidfilament, and a cupshaped translucent shield partially enclosing the filament and stem, the normally free end of the filament supporting stem being secured to the interior of the cup.

6. In an electric light bulb, in combination, a glass container having a frustro-conical sleeve shaped lower portion-the interior wall of said sleeve having a mirror-like surface, a filament, a supporting stem for said filament, and a cupshaped translucent lens partially enclosing the filament and stem, the normally free end of the filament supporting stem being secured to the 20 

